request.py 文件源码

def urlopen(url, data=None, timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
            *, cafile=None, capath=None):
    global _opener
    if cafile or capath:
        if not _have_ssl:
            raise ValueError('SSL support not available')
        context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
        context.options |= ssl.OP_NO_SSLv2
        if cafile or capath:
            context.verify_mode = ssl.CERT_REQUIRED
            context.load_verify_locations(cafile, capath)
            check_hostname = True
        else:
            check_hostname = False
        https_handler = HTTPSHandler(context=context, check_hostname=check_hostname)
        opener = build_opener(https_handler)
    elif _opener is None:
        _opener = opener = build_opener()
    else:
        opener = _opener
    return opener.open(url, data, timeout)